84142-89-2Relevant academic research and scientific papers
DIE BILDUNG (E)(Z)-ISOMERER ALKENYLZIRCONOCEN-KOMPLEXE
Czisch, Peter,Erker, Gerhard
, p. C9 - C11 (1983)
Photolysis of the hydrozirconation product 1(E) of phenylacetylene yields a 70/30 mixture of (Z)- and (E)-β-styrylzirconocene chloride.Reaction of the 1(E)/1(Z) mixture with organolithium or Grignard reagents gives alkenylzirconocene complexes with a substantial excess of the (Z)-isomer.The photochemically induced geometrical isomerization of alkyl- and aryl(alkenyl)zirconocenes can also be observed, provided the decomposition rate of these organozirconium complexes is being sufficiently reduced by added triphenylphosphine or trimethylphosphite.
Transfer and coupling of zirconocene-bound alkenyl ligands. An alternative route to (s-trans-η4-conjugated diene)ZrCp2 complexes
Czisch, Peter,Erker, Gerhard,Korth, Hans-Gert,Sustmann, Reiner
, p. 945 - 947 (2008/10/08)
Dibenzylzirconocene (3a) and (s-trans-η4-trans ,trans-1,4-diphenylbutadiene)zirconocene (5) are formed rapidly upon irradiation of benzyl(β-styryl)-zirconocene (2a) in benzene at ambient temperature. Trapping and crossover experiments using benzyl chloride and (β-styryl)zirconocene chloride and the kinetic influence of added moderators trimethyl phosphite and triphenylphosphine in addition to ESR experiments point to a radical reaction mechanism for alkenyl group transfer. Transfer and coupling of alkenyl ligands can also be initiated in a dark reaction when starting from methyl(β-styryl)zirconocene (2b).
